/* 认证页水滴：纯CSS材质，所有装饰不接收指针或键盘事件。 */
.water-auth {
  --water-light: #ffffffef;
  --water-shadow: #558bb32b;
  position: relative;
  isolation: isolate;
}
.auth-water {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}
.water-drop {
  position: absolute;
  display: block;
  width: var(--drop-size, 24px);
  height: calc(var(--drop-size, 24px) * 1.14);
  border: 1px solid #ffffffac;
  border-radius: 56% 44% 52% 48% / 44% 40% 60% 56%;
  background:
    radial-gradient(ellipse at 29% 22%, #ffffffea 0 5%, #ffffff10 17%, transparent 26%),
    radial-gradient(ellipse at 72% 78%, #d4f9ffb3, transparent 53%),
    linear-gradient(140deg, #ffffff6b, #8db9dd16 50%, #e4f9ff6b);
  box-shadow:
    inset 2px 2px 3px var(--water-light),
    inset -2px -3px 5px var(--water-shadow),
    1px 5px 8px #587da61f;
  backdrop-filter: blur(1px) saturate(1.2);
  transform: rotate(var(--drop-angle, 20deg));
  pointer-events: none;
}
.water-drop::after {
  content: '';
  position: absolute;
  top: 15%; left: 17%;
  width: 25%; height: 42%;
  border-left: 1.5px solid var(--water-light);
  border-radius: 50%;
  transform: rotate(24deg);
  opacity: .8;
}
.scene-drop-one { --drop-size: 26px; --drop-angle: -22deg; left: 1%; top: 49%; }
.scene-drop-two { --drop-size: 31px; --drop-angle: 28deg; left: 47%; top: 34%; }
.scene-drop-three { --drop-size: 12px; left: 51%; top: 58%; }
.scene-drop-four { --drop-size: 18px; --drop-angle: -30deg; left: 13%; bottom: 5%; }
.water-ripple {
  position: absolute;
  bottom: 4%; left: 23%; width: 125px; height: 30px;
  border: 1px solid #ffffff75;
  border-radius: 50%;
  box-shadow: 0 0 0 8px #e5faff16, inset 0 2px 3px #b8dfe720;
  transform: rotate(-8deg);
}
.auth .auth-card {
  overflow: visible;
  border: 1px solid #ffffffd9;
  border-radius: 32px;
  background:
    radial-gradient(ellipse at 100% 0%, #d2edff38, transparent 46%),
    linear-gradient(135deg, var(--color-surface-hover), var(--color-surface));
  box-shadow:
    inset 1px 2px 2px #ffffffed,
    inset -1px -2px 3px #c3e5f463,
    0 19px 38px -22px #578db44a,
    0 6px 12px -7px #5986b338;
}
.auth-card::after {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: 28px;
  border: 1px solid transparent;
  border-top-color: #ffffff66;
  border-right-color: #ffffff4d;
  box-shadow: inset -1px 0 1px #a1d6ec24;
  pointer-events: none;
}
.auth-card > .card-water {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  border-radius: inherit;
}
.edge-drop-one { --drop-size: 30px; --drop-angle: 36deg; right: 19px; top: -16px; }
.edge-drop-two { --drop-size: 10px; right: 59px; top: -5px; }
.edge-drop-three { --drop-size: 16px; --drop-angle: -13deg; right: -9px; top: 38%; }
.edge-drop-four { --drop-size: 34px; --drop-angle: -28deg; left: -15px; bottom: 40px; }
.edge-drop-five { --drop-size: 9px; left: 14px; bottom: 17px; }
.auth-card input:not([type=checkbox]) {
  border-color: #b2cddd87;
  background: linear-gradient(140deg, #ffffff63, #ffffff30);
  box-shadow: inset 0 1px 2px #ffffffb0, 0 1px 0 #ffffff77;
}
.auth-card input:not([type=checkbox]):focus {
  border-color: #88bed6;
  box-shadow: inset 0 1px 2px #ffffffcc, 0 0 0 3px #a7d6e62c;
}
.auth-card:focus-within { border-color: #e8faff; }

/* 登录页水晶字面与按钮：高光保持克制，正文保留实色可读性。 */
.login-crystal, .login-header, .member-theme {
  --crystal-ink: #355981;
  --crystal-reflection: #5a8aa4;
  --crystal-text-edge: #ffffffb3;
  --crystal-button: #355382;
  --crystal-top: #edfafff0;
  --crystal-mid: #aecce9a6;
  --crystal-bottom: #8ba6dc99;
  --crystal-secondary-top: #ffffffb8;
  --crystal-secondary-bottom: #c2e5ec66;
}
.login-crystal .koi-copy h1 span,
.login-crystal .auth-card-heading h1,
.login-header .brand span {
  color: var(--crystal-ink);
  background: linear-gradient(172deg, var(--crystal-ink) 10%, var(--crystal-reflection) 40%, var(--crystal-ink) 44%, var(--crystal-reflection) 72%, var(--crystal-ink) 94%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 1px 0 var(--crystal-text-edge)) drop-shadow(0 2px 1px #5486a526);
}
.login-crystal .muted,
.login-crystal .auth-card label,
.login-crystal .auth-card a:not(.btn) {
  text-shadow: 0 1px 0 var(--crystal-text-edge);
}
.login-crystal .auth-card { padding: 38px 38px 28px; }
.login-crystal .auth-card-heading { text-align: center; margin-bottom: 30px; }
.login-crystal .auth-card-heading h1 { font-size: 30px; letter-spacing: .02em; }
.login-crystal .auth-intro { margin: 10px 0 0; line-height: 1.8; }
.login-crystal #auth-form { gap: 20px; }
.login-crystal .auth-card input:not([type=checkbox]) { min-height: 50px; border-radius: 12px; margin-top: 9px; }
.login-options { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.login-options a { font-size: 12px; color: var(--crystal-button); }
.login-options a:hover { text-decoration: underline; text-underline-offset: 4px; }
.login-crystal .login-remember { font-size: 12px; color: var(--color-muted); }
.login-crystal .error-text:empty { display: none; }
.login-crystal .error-text:not(:empty) { margin-top: -6px; }
.login-card-footer {
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 6px;
  margin-top: 20px; font-size: 12px;
}
.login-register-link { display: inline-flex; align-items: center; min-height: 44px; padding: 6px 2px; color: var(--crystal-button); font-weight: 600; text-underline-offset: 4px; }
.login-register-link:hover, .login-register-link:focus-visible { text-decoration: underline; }
.login-crystal .auth-card .btn {
  border: 1px solid #ffffffd9;
  border-radius: 14px;
  color: var(--crystal-button);
  text-shadow: 0 1px 0 var(--crystal-text-edge);
  backdrop-filter: blur(12px) saturate(1.15);
  -webkit-backdrop-filter: blur(12px) saturate(1.15);
  box-shadow: inset 0 2px 1px #ffffffe6, inset 0 -2px 2px #658caf30, inset 1px 0 1px #ffffffb8, 0 7px 14px -7px #547aa66b;
  isolation: isolate;
}
.login-crystal .auth-card .btn:not(.ghost):not(.secondary):not(.danger) {
  min-height: 50px;
  font-weight: 650;
  letter-spacing: .08em;
  background:
    linear-gradient(115deg, transparent 25%, #ffffff5c 41%, #ffffff0d 44%, transparent 58%),
    linear-gradient(180deg, var(--crystal-top), var(--crystal-mid) 49%, var(--crystal-bottom) 51%, #c8dff4b3);
  box-shadow: inset 0 2px 1px #fffffff2, inset 0 -2px 2px #5c82b447, inset 1px 0 1px #ffffffb8, 0 8px 18px -7px #547ba678;
}
.login-crystal .auth-card .btn.ghost {
  padding: 8px 14px;
  min-height: 38px;
  background: linear-gradient(155deg, var(--crystal-secondary-top), var(--crystal-secondary-bottom));
}
.login-crystal .auth-card .btn::before {
  content: '';
  position: absolute;
  z-index: -1;
  inset: 2px;
  border-radius: 11px;
  border: 1px solid #ffffff40;
  border-top-color: #ffffffb3;
  background: linear-gradient(105deg, transparent 22%, #ffffff69 42%, transparent 61%);
  background-size: 240% 100%;
  background-position: 100% 0;
  transition: background-position 550ms var(--ease);
  pointer-events: none;
}
.login-crystal .auth-card .btn:hover {
  border-color: #fff;
  box-shadow: inset 0 2px 1px #fff, inset 0 -2px 2px #658caf30, 0 10px 19px -9px #547ba680;
}
.login-crystal .auth-card .btn:hover::before,
.login-crystal .auth-card .btn:focus-visible::before { background-position: 0 0; }
.login-crystal .auth-card .btn:active {
  box-shadow: inset 0 2px 5px #537da433, inset 0 -1px 0 #ffffffd9, 0 3px 8px -5px #547ba659;
}
[data-theme=dark] .login-crystal, [data-theme=dark] .login-header, [data-theme=dark] .member-theme {
  --crystal-ink: #d5e9ff;
  --crystal-reflection: #9fc9e4;
  --crystal-text-edge: #365b8273;
  --crystal-button: #e1f5ff;
  --crystal-top: #97c3df59;
  --crystal-mid: #496992b0;
  --crystal-bottom: #456185c2;
  --crystal-secondary-top: #809abc45;
  --crystal-secondary-bottom: #305b7566;
}
[data-theme=dark] .login-crystal .auth-card .btn {
  border-color: #b9e2fa85;
  box-shadow: inset 0 1px 1px #def3ff7d, inset 0 -2px 2px #1129494d, 0 7px 14px -7px #061327a6;
}
[data-theme=dark] .login-crystal .auth-card .btn:not(.ghost):not(.secondary):not(.danger) {
  background: linear-gradient(115deg, transparent 25%, #ffffff1f 41%, transparent 58%), linear-gradient(180deg, var(--crystal-top), var(--crystal-mid) 49%, var(--crystal-bottom) 51%, #6499bc7d);
}
[data-theme=dark] .login-crystal .auth-card .btn::before { border-color: #d9f2ff1a; border-top-color: #e0f6ff59; background-image: linear-gradient(105deg, transparent 22%, #c2eaff26 42%, transparent 61%); }
@media (prefers-reduced-motion: reduce) {
  .login-crystal .auth-card .btn::before { transition: none; }
}
@media (forced-colors: active) {
  .login-crystal .koi-copy h1 span, .login-crystal .auth-card-heading h1, .login-header .brand span { -webkit-text-fill-color: currentColor; background: none; filter: none; }
}
[data-theme=dark] .water-auth {
  --water-light: #d6f4ffb3;
  --water-shadow: #07182b66;
}
[data-theme=dark] .water-drop {
  border-color: #cbeaff69;
  background:
    radial-gradient(ellipse at 29% 22%, #ffffffb0 0 5%, #ffffff10 17%, transparent 26%),
    radial-gradient(ellipse at 72% 78%, #83c4df45, transparent 53%),
    linear-gradient(140deg, #aecde536, #7099c20d 50%, #b3e5ed26);
}
[data-theme=dark] .auth .auth-card {
  border-color: #b1d8fa4f;
  box-shadow: inset 1px 2px 2px #c8e7ff38, inset -1px -2px 3px #65a4be20, 0 19px 38px -22px #050d2366;
}
[data-theme=dark] .auth-card::after { border-top-color: #c9e6ff29; border-right-color: #c9e6ff20; }
[data-theme=dark] .auth-card input:not([type=checkbox]) { border-color: #97bbd44d; background: #26365157; box-shadow: inset 0 1px 2px #c1dfff16; }
@media (max-width: 960px) {
  .login-crystal .auth-card { padding: 32px 26px 26px; }
  .scene-drop-two { --drop-size: 23px; left: 45%; top: 23%; }
  .scene-drop-three { display: none; }
  .water-ripple { width: 95px; left: 20%; bottom: 15%; }
}
@media (max-width: 600px) {
  .login-crystal .auth-card { padding: 30px 24px 24px; }
  .login-crystal .auth-card-heading { margin-bottom: 26px; }
  .login-crystal .auth-card-heading h1 { font-size: 28px; }
  .login-crystal .auth-intro { font-size: 11px; }
  .auth-card input:not([type=checkbox]),
  .auth-card select,
  .auth-card textarea { font-size: 16px; }
  .water-auth { overflow: clip; padding-bottom: 28px; }
  .water-auth + .preview { position: relative; right: auto; bottom: auto; width: fit-content; margin: 0 18px 18px auto; }
  .auth-water { inset: 0 18px; }
  .scene-drop-one { --drop-size: 17px; left: 44%; top: 9%; }
  .scene-drop-two { --drop-size: 11px; left: 6%; top: 22%; }
  .scene-drop-four, .water-ripple { display: none; }
  .edge-drop-one { --drop-size: 24px; right: 20px; top: -12px; }
  .edge-drop-two { right: 50px; }
  .edge-drop-three { --drop-size: 12px; right: -5px; }
  .edge-drop-four { --drop-size: 25px; left: -8px; bottom: 38px; }
  .edge-drop-five { left: 13px; bottom: 18px; }
}